Developers include implementations of ServerApplicationConfig in an archive containing
websocket endpoints (WAR file, or JAR file within the WAR file) in order to specify the websocket
endpoints within the archive the implementation must deploy.

The ServerEndpointConfig.Configurator class may be extended by developers who want to
provide custom configuration algorithms, such as intercepting the opening handshake, or
providing arbitrary methods and algorithms that can be accessed from each endpoint
instance configured with this configurator.